/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io;



import com.bff.gaia.unified.sdk.Pipeline;

import com.bff.gaia.unified.sdk.transforms.PTransform;

import com.bff.gaia.unified.sdk.values.*;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableMap;

import com.bff.gaia.unified.sdk.values.KV;

import com.bff.gaia.unified.sdk.values.PCollection;

import com.bff.gaia.unified.sdk.values.PInput;

import com.bff.gaia.unified.sdk.values.POutput;

import com.bff.gaia.unified.sdk.values.PValue;

import com.bff.gaia.unified.sdk.values.TupleTag;



import java.util.Map;



/** The result of a {@link WriteFiles} transform. */

public class WriteFilesResult<DestinationT> implements POutput {

  private final Pipeline pipeline;

  private final TupleTag<KV<DestinationT, String>> perDestinationOutputFilenamesTag;

  private final PCollection<KV<DestinationT, String>> perDestinationOutputFilenames;



  private WriteFilesResult(

      Pipeline pipeline,

      TupleTag<KV<DestinationT, String>> perDestinationOutputFilenamesTag,

      PCollection<KV<DestinationT, String>> perDestinationOutputFilenames) {

    this.pipeline = pipeline;

    this.perDestinationOutputFilenamesTag = perDestinationOutputFilenamesTag;

    this.perDestinationOutputFilenames = perDestinationOutputFilenames;

  }



  static <DestinationT> WriteFilesResult<DestinationT> in(

      Pipeline pipeline,

      TupleTag<KV<DestinationT, String>> perDestinationOutputFilenamesTag,

      PCollection<KV<DestinationT, String>> perDestinationOutputFilenames) {

    return new WriteFilesResult<>(

        pipeline, perDestinationOutputFilenamesTag, perDestinationOutputFilenames);

  }



  @Override

  public Map<TupleTag<?>, PValue> expand() {

    return ImmutableMap.of(perDestinationOutputFilenamesTag, perDestinationOutputFilenames);

  }



  @Override

  public Pipeline getPipeline() {

    return pipeline;

  }



  @Override

  public void finishSpecifyingOutput(

	  String transformName, PInput input, PTransform<?, ?> transform) {}



  /**

   * Returns a {@link PCollection} of all output filenames generated by this {@link WriteFiles}

   * organized by user destination type.

   */

  public PCollection<KV<DestinationT, String>> getPerDestinationOutputFilenames() {

    return perDestinationOutputFilenames;

  }

}